Maintenance importance determination system, maintenance importance determination method, and maintenance importance determination program

Abstract

To provide a maintenance importance determination system capable of identifying a device that has a large impact on safety or economic efficiency when function decreases or is lost.SOLUTION: A maintenance importance determination system 1 includes: a storage unit 57 that stores an influence table 22 indicating the degree of influence of each system function achieved by a series of a device on a nuclear power plant, and an element function table 25 indicating the degree of necessity of the element function in which system function is decomposed; an element function identification part 13 that identifies an important element function using the degree of necessity of the element function and the degree of influence of the system function to which the element function belongs; and a device identification unit 14 that identifies a device necessary to achieve the important element function identified by the element function identification unit 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a maintenance importance determination system, a maintenance importance determination method, and a maintenance importance determination program. [Background technology]

[0002] In the field of nuclear safety, probabilistic risk assessment (PRA) is known, which quantitatively evaluates the frequency of occurrence of core damage, a serious accident event, and its impact when it occurs, and evaluates it as a "risk" which is the product of these two factors.

[0003] In order for power suppliers to provide a stable, continuous supply of electricity at low cost to power users, it is necessary to improve the safety and / or economic efficiency of power plants, not just core damage, and reduce the probability of occurrence of high-risk events and their impact (risk). For this reason, methods that can be expected to improve safety and / or economic efficiency more effectively within limited resources are required.

[0004] Patent Document 1 describes an invention that includes an equipment importance evaluation support system 11 that inputs plant design and operation information and risk information, evaluates the importance of plant facilities and equipment, and outputs importance rank information for the plant facilities and equipment, and a risk information evaluation system 12 that inputs the plant design and operation information and risk information, determines whether online maintenance can be performed, and outputs information on whether online maintenance can be performed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-252311 Summary of the Invention [Problem to be solved by the invention]

[0006] It is effective to organize the risks posed by the deterioration or loss of functionality of the equipment used in the power plant and prioritize maintenance of the equipment with the greatest risk in order to maintain and improve safety and economic efficiency.However, analyzing the frequency of occurrence of events requires a huge amount of man-hours, so analyzing the frequency of occurrence of events for all the equipment installed in the power plant and identifying the equipment is not realistic in the short term.

[0007] Therefore, an object of the present invention is to identify equipment that will have a large impact on safety or economy when its function is reduced or lost. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the maintenance importance determination system of the present invention includes an element function specifying unit that specifies important element functions based on the degree of influence on a nuclear power plant evaluated by a manager for each system function achieved by a series of devices and based on an element function table showing the degree of necessity of element functions into which the system functions are decomposed, multiplying the degree of necessity of the element function by the degree of influence of the system function to which the element function belongs, and a correspondence between the element functions and devices that have an effect on the system functions. Regarding each of the above-mentioned devices, whether it is necessary or not for achieving the above-mentioned important element functions and a device specifying unit that specifies a device required to achieve the important element function specified by the element function specifying unit based on a device table that stores the above-mentioned.

[0009] The maintenance importance determination method of the present invention includes the steps of: an element function specifying unit specifying important element functions in accordance with a result of multiplying the necessity of an element function by the influence of the system function to which the element function belongs, based on the influence on the nuclear power plant evaluated by a manager for each system function achieved by a series of devices and based on the necessity of the element functions into which the system functions are decomposed; and an equipment specifying unit specifying a correspondence between the element functions and devices that affect the system functions. Regarding each of the above-mentioned devices, whether it is necessary or not for achieving the above-mentioned important element functions and a step of identifying a device required to achieve the important element function identified by the element function identifying unit based on a device table storing the above-mentioned.

[0010] The maintenance importance determination program of the present invention includes a procedure for specifying important element functions in accordance with a result of multiplying the necessity of an element function by the influence of the element function to which the element function belongs, based on the influence on the nuclear power plant evaluated by a manager for each system function achieved by a series of devices and based on an element function table showing the necessity of element functions into which the system functions are decomposed, and determining a correspondence between the element functions and devices that affect the system functions. Regarding each of the above-mentioned devices, whether it is necessary or not for achieving the above-mentioned important element functions The device table stores the above-mentioned items, and then executes a procedure for identifying the devices necessary for achieving the identified important element functions. Other means will be described in the detailed description of the invention. [Effects of the Invention]

[0011] According to the present invention, it is possible to identify equipment that will have a large impact on safety or economy when its function is reduced or lost. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a configuration diagram of a maintenance importance determination system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a hardware configuration diagram of a server that constitutes the maintenance importance determination system. [Figure 3] FIG. 1 is a diagram illustrating the functions of a nuclear power plant system broken down into parts and the devices that implement those functions. [Figure 4] 10 is a flowchart of a maintenance importance determination process. [Figure 5] FIG. 10 is a diagram illustrating an influence degree table. [Figure 6] FIG. 10 is a diagram illustrating an influence rank table. [Figure 7] 10 is a flowchart of a process for determining a method for evaluating the impact of a grid function. [Figure 8] FIG. 10 is a diagram illustrating a necessity rank table. [Figure 9] 10 is a flowchart of a process for generating a necessity rank table. [Figure 10] FIG. 10 is a diagram illustrating a necessity definition table. [Figure 11] FIG. 10 is a diagram illustrating an element function table. [Figure 12] FIG. 10 is a diagram illustrating a device table showing the correspondence between devices that affect system functions and element functions. [Figure 13] FIG. 10 is a diagram illustrating a device table showing correspondence between devices that affect system functions, system monitoring parameters, and element functions. [Figure 14] FIG. 10 is a diagram illustrating a table for identifying devices that affect a system function. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is based on the following PDCA (Plan, Do, Check, Action) cycle. In this embodiment, facilities, equipment, and parts are all referred to as "equipment." The first step in the PDCA cycle is creating a resource investment plan. In this step, the planner creates a resource investment plan for maintaining and improving safety and / or economy based on the evaluation results of maintenance importance. Here, the planner creates a plan for implementing and improving maintenance, focusing on equipment with high maintenance importance. Then, for equipment with low maintenance importance, the planner can apply measures to reduce the traditional maintenance work, such as disassembling and inspecting this equipment.

[0014] The second step in the PDCA cycle is the implementation of a resource investment plan. This is intended to maintain and improve safety and economic efficiency, and plant managers implement measures to maintain and improve the safety and economic efficiency of nuclear power plants. Specifically, measures to maintain and improve the safety and economic efficiency of nuclear power plants include not only system or equipment inspections, testing, and testing, but also management such as patrols during operation, as well as equipment failure probability analysis, predictive diagnosis of equipment function degradation or loss, and advanced maintenance through degradation diagnosis and performance monitoring.

[0015] The third step in the PDCA cycle is to verify the effectiveness of the resource investment plan. In this step, the plant manager quantifies the effectiveness of measures to maintain and improve safety and economic efficiency, and verifies whether the analysis results show a significant risk due to a decline in equipment performance or loss. The plant manager then provides feedback on the evaluation results.

[0016] An example of the third step is a step of analyzing the failure probability of equipment. Based on the risk information, the plant manager optimizes maintenance tasks and reduces the failure probability. The plant manager further monitors the performance and function trends of the systems and equipment to diagnose the status of the systems and equipment. This makes it possible to extend the maintenance cycle for equipment in good condition. This makes it possible to reduce the maintenance costs of the entire plant while maintaining the specified performance and function of the equipment. Furthermore, by shortening the maintenance cycle for equipment whose condition is deteriorating, the entire plant can be maintained optimally. The fourth step of the PDCA cycle is to accumulate implementation information and plant operation information, and to evaluate the importance of equipment according to the present invention. After this fourth step is completed, the next first step is executed again.

[0017] This analysis method identifies equipment that may pose a high risk if its function is impaired or lost and has a significant impact on safety and / or economic efficiency. In this analysis method, equipment evaluation information is used as input information for implementation plans such as management of the target equipment, risk analysis, sensing of existing equipment or its performance monitoring, deterioration diagnosis, etc. In addition, this analysis method also makes it possible to extract low-risk equipment by widening the scope of evaluation, and can be used as input information for maintenance optimization, etc.

[0018] FIG. 1 is a configuration diagram of a maintenance importance determination system 1 according to this embodiment. The maintenance importance determination system 1 is configured to include the server 5 of Fig. 2, and is equipped with an element function identification unit 13, an equipment identification unit 14, and a memory unit 57. The maintenance importance determination system 1 also stores an impact rank table 21, an impact table 22, a necessity rank table 23, a necessity definition table 24, and an element function table 25 in the memory unit 57. The maintenance importance determination system 1 extracts equipment that will have a large impact on safety or economy when its function is degraded or lost.

[0019] The element function identifying unit 13 identifies important element functions using the degree of necessity of the element functions and the degree of influence of the system functions to which the element functions belong. The device identifying unit 14 identifies devices necessary for achieving the important elemental functions identified by the elemental function identifying unit 13. The device identifying unit 14 further identifies devices that affect each system function.

[0020] The impact rank table 21 is a table that defines the impact of a system function achieved by a series of devices on the function of a nuclear power plant, and will be described in detail later with reference to FIG. The impact table 22 shows the impact of each system function achieved by a series of devices on the nuclear power plant, and will be described in detail later with reference to Fig. 7. This impact table 22 defines the impact of each system function on the nuclear power plant as the impact of a decline or loss of the system function, including any of the following points of view: "impact on safety," "impact on power generation," "protection of property," and "impact on the environment and human disasters."

[0021] The necessity rank table 23 is a table that defines the ranks of the necessity, and will be described in detail later with reference to FIG. The necessity definition table 24 is a table that defines the necessity of element functions, and will be described in detail later with reference to FIG.

[0022] The element function table 25 is a table containing element functions obtained by breaking down system functions and their degrees of necessity, and will be described in detail later with reference to Fig. 11. This element function table 25 is created using the necessity rank table 23.

[0023] The device table 26 is a table showing the correspondence between element functions and the devices required to achieve them, and will be described in detail later with reference to FIG.

[0024] FIG. 2 is a hardware configuration diagram of the server 5 that constitutes the maintenance importance determination system 1. As shown in FIG. The server 5 is, for example, a computer installed in a data center. The server 5 includes a CPU (Central Processing Unit) 51, a storage unit 57, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, an operation unit 54, a display unit 55, and a communication unit 56.

[0025] The CPU 51 is a central processing unit that executes a program 571 stored in the storage unit 57. The program 571 is executed by the CPU 51 to perform the processes shown in FIG. The CPU 61 executes the program 571 to implement the respective functional units shown in FIG.

[0026] The storage unit 57 is a large-capacity storage device, and is configured, for example, by a hard disk drive or flash memory.

[0027] The RAM 53 is a volatile memory and functions as a work area for temporarily storing various programs executable by the CPU 51, input data, output data, parameters, etc. The ROM 52 is a non-volatile memory and stores, for example, a BIOS (Basic I / O System).

[0028] The operation unit 54 is configured with a keyboard equipped with cursor keys, numeric input keys, various function keys, etc., and a pointing device such as a mouse. The operation unit 54 detects press signals of keys pressed on the keyboard and operation signals from the mouse. The CPU 51 executes various processes based on the operation signals from the operation unit 54.

[0029] The display unit 55 is configured to include a monitor display such as an LCD (Liquid Crystal Display), etc. The display unit 55 displays various screens according to display signals input from the CPU 51. The display unit 55 and the operation unit 54 may also employ a touch panel display.

[0030] FIG. 3 is a diagram illustrating the functions of a nuclear power plant system broken down into parts and the equipment that realizes them. A nuclear power plant includes a system 3 consisting of a series of equipment related to a certain function, and system functions 31 to 33 achieved by the equipment in system 3. The functions of a nuclear power plant include soundness, safety, power generation capacity, etc. System functions 31 to 33 refer to the functions of each system that are necessary to achieve the function of the nuclear power plant.

[0031] System 3 is, for example, a reactor cooling system, an instrumentation and control system, etc. When system 3 is a reactor cooling system, system functions 31 to 33 are, for example, a main steam isolation function, a high-pressure core spray function, a low-pressure core spray function, a reactor auxiliary cooling function, etc.

[0032] When system 3 is an instrumentation and control system, system functions 31 to 33 are, for example, system functions, control rod drive functions, boric acid water injection functions, reactor protection system interlock functions, etc. Here, system function 31 is highlighted by hatching because its influence exceeds a predetermined level.

[0033] The element functions 311 to 313 belonging to the system function 31 are functions obtained by breaking down the system function 31 into individual elements, such as pressure resistance, water supply / ventilation, flow path configuration, heat exchange, purification, measurement, and control. The element functions 311 to 313 are functions necessary to achieve the system function 31. Here, the element functions 311 and 312 are highlighted with hatching because their degree of necessity exceeds a predetermined level.

[0034] The devices 3111 to 3131 are devices that support the element functions 311 to 313. The devices 3111 to 3131 are devices that are involved in the performance of the element functions 311 and 312, and are therefore highlighted by hatching. Element functions 321 and 322 belonging to system function 32 are functions obtained by breaking down system function 32 into elements. Equipment 3211 is involved in the performance of element functions 321 and 322. Element functions 331 and 332 belonging to system function 33 are functions obtained by breaking down system function 33 into elements.

[0035] FIG. 4 is a flowchart of the maintenance importance determination process. In order to evaluate equipment that will have a significant impact on safety or economic efficiency when its function is reduced or lost, each system is broken down into its system functions, the element functions of the system functions, and the equipment related to the performance of the element functions.

[0036] First, the manager of the nuclear power plant defines an evaluation method for each impact and necessity (step S11). Then, the manager determines the impact of each system function (step S12) and extracts element functions related to the system function (step S13). The manager evaluates the necessity of the element functions (step S14).

[0037] The element function identification unit 13 of the maintenance importance determination system 1 identifies important element functions based on the degree of influence of the system functions on the functions of the nuclear power plant and the necessity of the element functions (step S15). Then, the equipment identification unit 14 of the maintenance importance determination system 1 identifies equipment that has a large influence on important element functions (step S16), and when the equipment that has a large influence on the system functions is identified (step S17), the maintenance importance determination process of Fig. 4 is terminated. As a result, the maintenance importance determination system 1 evaluates the magnitude of the influence of the element functions on the functions of the nuclear power plant as importance. In other words, the maintenance importance determination system 1 supports the extraction of equipment for which priority should be given to improving safety by evaluating the elements and their influences.

[0038] FIG. 5 is a diagram illustrating the influence rank table 21. As shown in FIG. The impact rank table 21 is a table that defines the impact of a system function on the function of a nuclear power plant. The impact rank column is a column that stores impact ranks A to D. The rows of this impact rank table 21 are arranged in descending order of impact. The impact (1) to impact (3) columns are columns for storing definitions of the impact of each of the system functions 31 to 33, respectively.

[0039] FIG. 6 is a flowchart of a process for determining a method for evaluating the impact of a grid function. The manager of this nuclear power plant categorizes the impact on plant functions in the event of a grid function failure (step S21). The manager then defines the degree of impact for each item (step S22). Here, the manager defines the maximum impact, minimum impact, and other intermediate impacts on grid functions within a range that can be distinguished as the magnitude of the impact. The manager then ranks the definition of the impact for each item (step S23), determines a method for evaluating the impact on grid functions from the impact items organized in the impact rank table 21 (step S24), and terminates the processing of FIG. 6.

[0040] FIG. 7 is a diagram illustrating the influence degree table 22. As shown in FIG. 7, the impact assessment of the system functions is quantified as impact ranks, and the largest corresponding value is evaluated as the impact. The range of assessment ranges from the entire system to each system function. In this embodiment, the impact of each system function is determined using an impact determination table based on definitions and rankings such as impact table 22.

[0041] In the safety impact column, impact level 4 includes equipment of class 1 in the safety importance classification or SA equipment (safety measure equipment). Impact level 3 is composed of the following equipment of class 2 in the safety importance classification. Impact level 2 is composed of the following equipment of class 3 in the safety importance classification. Impact level 1 is composed of non-class equipment in the safety importance classification.

[0042] In the power generation impact column, impact level 4 is something that may lead to a power generation outage. Impact level 3 is something that may cause fluctuations in power generation output. Impact level 2 is something that does not affect generator output but may require some functional operational restrictions. Impact level 1 is something that has no impact on power generation.

[0043] In the asset protection impact column, impact level 3 is equipment that may require large-scale construction work, such as replacing or repairing multiple pieces of equipment, during recovery. Impact level 2 is equipment that may require replacement or repair of individual pieces of equipment during recovery. Impact level 1 is equipment that may require replacement or repair of individual parts during recovery.

[0044] In the impact column for environmental and human disasters, impact level 4 is equipment that may cause environmental pollution or affect the safety of employees. Impact level 3 is equipment that may cause environmental pollution or affect the safety of employees. Impact level 2 is equipment that may cause minor environmental pollution or other impacts other than those mentioned above.

[0045] The above-mentioned method of assigning points to the degree of influence and determining the boundaries of the definition is to take the maximum value of the rank hierarchy. However, this is not limited to this, and the sum of the ranks of each cell may be used as the degree of influence.

[0046] 8 is a diagram illustrating the necessity rank table 23. This necessity rank table 23 is a table in which ranks of the degree of necessity of element functions for demonstrating system functions are defined. The necessity rank column stores the ranks of the degree of necessity, and in this case, ranks of the degree of necessity from A to D are stored. When the necessity rank is A, it is the maximum degree of necessity. When the necessity rank is D, it is the minimum degree of necessity. The definition column stores definitions corresponding to these necessity ranks.

[0047] FIG. 9 is a flowchart of the process for generating the necessity rank table 23. The manager of this nuclear power plant defines the degree of necessity for each item (step S31), and when the manager ranks the definitions of the degree of necessity (step S32), the process of FIG. 9 ends.

[0048] 10 is a diagram for explaining the necessity definition table 24. This necessity definition table 24 is an example in which the necessity of element functions for achieving system functions is defined. Element functions that are essential to achieving the required function have a necessity level of 5.

[0049] An element function that is necessary to achieve the desired function, but whose decline or loss does not have a significant impact on the desired function, is rated as a necessity of 2. An element function that is not essential to achieve the desired function, but which should be secured in betterment, is rated as a necessity of 2.

[0050] An element function that is necessary to achieve the required function but is unlikely to be reduced or lost has a degree of necessity of 1. An element function that is not necessary to achieve the required function has a degree of necessity of 0.

[0051] FIG. 11 is a diagram for explaining the element function table 25. As shown in FIG. ANSI / ANS-58.14 Appendix D "Typical Component Functions" lists 25 typical functions that must be evaluated when determining the safety-related classification of a component or part. These 25 functions are used as element functions for decomposing system functions. However, this is not limited to this, and system functions may be decomposed into element functions using these 25 functions as a reference. In this case, the equipment importance determination system 1 appropriately sets the granularity of the element functions depending on the degree of influence of the system functions.

[0052] When creating the impact rank table 21 (see FIG. 5) described above, element functions are appropriately selected from the viewpoint of the objective. When evaluating the importance of equipment, the granularity of element functions is determined from the viewpoint of how the importance is to be affected by the system functions. In the component function table 25 of this embodiment, the component functions are classified into those that are commonly possessed by each system, with reference to ANSI / ANS-58.14 Appendix D "Typical Component Functions."

[0053] Here, the elemental functions are classified into seven types: pressure resistance, water supply / ventilation, flow path configuration, heat exchange, purification, measurement, and control. Pressure resistance is the function of holding the contained fluid and preventing it from leaking out. Water supply / ventilation is the function of applying pressure to the fluid to send it out. Flow path configuration is the function of either passing the fluid at the required flow rate or blocking it. Heat exchange is the function of cooling or heating the fluid. Purification is the function of removing impurities from the fluid. Measurement is the function of measuring the process quantity and sending a signal or directly instructing it. Control is the function of controlling the process quantity.

[0054] FIG. 12 is a diagram illustrating a device table 26 showing the correspondence between devices that affect the system functions and element functions. In this equipment table 26, each row shows equipment that affects the system function, and each column shows an element function. Each matrix shows equipment necessary to achieve the element function. When a "○" appears in a matrix, it indicates that the equipment is necessary to achieve the element function. When an "×" appears in a matrix, it indicates that the equipment is not necessary to achieve the element function.

[0055] FIG. 13 is a diagram illustrating a device table 27 in which devices that affect the system functions, system monitoring parameters, and element functions are registered. In order to confirm and ensure the stability of a nuclear power plant, it is effective to understand and monitor not only changes in events occurring in individual pieces of equipment, but also changes in parameters that may occur. As an example, we have extracted monitoring parameters for the system that may fluctuate due to changes in each element function.

[0056] In this equipment table 27, each row shows equipment and system monitoring parameters that affect system functions, and each column shows element functions. Each matrix shows equipment necessary to achieve an element function and system monitoring parameters necessary to monitor the element function. When a "○" appears in a matrix, it indicates that the equipment or system monitoring parameter is necessary to achieve or monitor the element function. When an "×" appears in a matrix, it indicates that the equipment or system monitoring parameter is not necessary to achieve or monitor the element function.

[0057] FIG. 14 is a diagram illustrating a table 28 for identifying devices that affect the system function and calculating their importance. Each row of table 28 indicates an element function. Each column of table 28 lists a certain system function, system function 31, a system monitoring parameter, and equipment that affects the system function. The impact of this system function 31 is 4 points. The necessity of withstand voltage, which is an element function, is 5 points. The evaluation of withstand voltage, which is an element function obtained by breaking down system function 31, is 20 points, which is the impact of system function 31 multiplied by the necessity of withstand voltage.

[0058] The equipment that affects the system function 31 and achieves the elemental function of pressure resistance are pumps, compressors, exhaust fans, heat exchangers, filtration and demineralization filters, and piping. Therefore, these pieces of equipment are assigned a rating of at least 20 points. This rating indicates the importance of these pieces of equipment.

[0059] The degree of necessity for the elemental function of water supply and ventilation is 5 points. The evaluation of the elemental function of water supply and ventilation, which is obtained by breaking down system function 31, is 20 points, which is the multiplication of the degree of influence of system function 31 by the degree of necessity for water supply and ventilation. The equipment that affects system function 31 and achieves the elemental function of water supply and ventilation are pumps, compressors, and exhaust fans. Therefore, these equipment are assigned an evaluation score of at least 20 points.

[0060] The degree of necessity of control, which is an element function, is 2 points. The evaluation of control, which is an element function obtained by breaking down system function 31, is 8 points, which is the product of the degree of influence of system function 31 and the degree of necessity of control. There is no equipment among the examples that affects system function 31 and achieves the element function of control.

[0061] In this way, the evaluation score of the importance of elemental functions is calculated from the impact of the system function and the necessity of the elemental function. Here, for each elemental function, the equipment required to achieve that elemental function is organized. Therefore, if there is overlap in the elemental functions achieved by the equipment, the importance of that equipment is calculated as the maximum or total value of the importance of the corresponding elemental functions. In this way, the equipment required to achieve important elemental functions and the monitoring parameters of the elemental functions are organized, and the impact on the system function is identified.

[0062] The manager of the nuclear power plant can use the evaluation results of the importance of each element function and each piece of equipment as input information for resource input planning, etc.

[0063] (Variation) The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0064] The above-described configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware such as an integrated circuit. The above-described configurations, functions, etc. may be realized by software by a processor interpreting and executing a program that realizes each function. Information such as the program, table, and file that realizes each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or in a storage medium such as a flash memory card or a DVD (Digital Versatile Disk).

[0065] In each embodiment, the control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are interconnected. [Explanation of symbols]

[0066] 1. Equipment importance determination system 13 Element Function Identification Section 14 Device identification section 21 Impact Ranking Table 22 Impact Table 23 Necessity Ranking Table 24 Necessity definition table 25 Element Function Table 26,27 Equipment Table 28 tables 3 systems 31~33 System Function 311~313 Element Function 321,322 Element Function 331,332 Element Function 3111 Equipment 3121 Equipment 3131 Equipment 3211 Equipment 5 Server 51 CPU 52 ROM 53 RAM 54 Operation section 55 Display section 56 Communications Department 57 Memory section 571 Programs

Claims

1. Based on the degree of impact on the nuclear power plant evaluated by the manager for each system function achieved by a series of devices, and based on an element function table showing the degree of necessity of element functions into which the system functions are decomposed, an element function specifying unit that specifies an important element function according to a result of multiplying the necessity of the element function by the influence of a system function to which the element function belongs; Regarding the correspondence relationship between the element functions and the devices that affect the system functions, based on a device table that stores whether each of the devices is necessary for achieving the important element functions, a device specifying unit that specifies a device necessary for achieving the important element function specified by the element function specifying unit; A maintenance importance determination system comprising:

2. the element function table is created using a necessity rank for the element functions; 2. The maintenance importance determination system according to claim 1.

3. The element function specifying unit Based on the degree of impact on the nuclear power plant assessed by the manager for each system function achieved by a series of devices, and based on the necessity of the element functions into which the system functions are decomposed, a step of identifying important element functions according to a result of multiplying the necessity of the element functions by the influence of the system function to which the element functions belong; The device identification department: Regarding the correspondence relationship between the element functions and the devices that affect the system functions, based on a device table that stores whether each of the devices is necessary for achieving the important element functions, a step of identifying a device necessary for achieving the important element function identified by the element function identifying unit; A maintenance importance determination method comprising:

4. On the computer, Based on the degree of impact on the nuclear power plant evaluated by the manager for each system function achieved by a series of devices, and based on an element function table showing the degree of necessity of element functions into which the system functions are decomposed, a step of identifying important element functions according to a result of multiplying the necessity of the element functions by the influence of the system function to which the element functions belong; Regarding the correspondence relationship between the element functions and the devices that affect the system functions, based on a device table that stores whether each of the devices is necessary for achieving the important element functions, a procedure for identifying the equipment necessary to achieve the identified important element functions; A maintenance importance assessment program for implementing the above.

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